linux-kernel - [39/80] hugetlb: release pages in the error path of hugetlb

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Message-Id: <20111207160825.865901776@clark.kroah.org>
Date:	Wed, 07 Dec 2011 08:06:59 -0800
From:	Greg KH <gregkh@...e.de>
To:	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Cc:	<torvalds@...ux-foundation.org>, <akpm@...ux-foundation.org>,
	<alan@...rguk.ukuu.org.uk>, Hillf Danton <dhillf@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <jweiner@...hat.com>,
	Michal Hocko <mhocko@...e.cz>
Subject: [39/80] hugetlb: release pages in the error path of hugetlb_cow()

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hillf Danton <dhillf@...il.com>

commit ea4039a34c4c206d015d34a49d0b00868e37db1d upstream.

If we fail to prepare an anon_vma, the {new, old}_page should be released,
or they will leak.

Signed-off-by: Hillf Danton <dhillf@...il.com>
Reviewed-by: Andrea Arcangeli <aarcange@...hat.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Johannes Weiner <jweiner@...hat.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michal Hocko <mhocko@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 mm/hugetlb.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2415,6 +2415,8 @@ retry_avoidcopy:
 	 * anon_vma prepared.
 	 */
 	if (unlikely(anon_vma_prepare(vma))) {
+		page_cache_release(new_page);
+		page_cache_release(old_page);
 		/* Caller expects lock to be held */
 		spin_lock(&mm->page_table_lock);
 		return VM_FAULT_OOM;


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